Which RNA base pairs with the adenine in DNA?
thymine
guanine
cytosine
uracil

In DNA adenine always pairs with thymine and cytosine always pairs with guanine. In RNA uracil replaces thymine, therefore in RNA adenine always pairs with uracil. Thymine and uracil or adenine have two hydrogen bonds between them, whereas guanine and cytosine have three.

Explanation:

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where is the diagram?

if you insert the diagram ill be able to you

the answer is:

carbon dioxide